Green’s Dictionary of Slang

snicker n.²

a drinking glass.

1822		Tom and Jerry; A Musical Extravaganza II v: Waiter, a pint of black strap and snickers.
1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.
1895		Crowe Aus. Sl. Dict. 77: Snicker, a drinking cup.

In derivatives

snickered (adj.)

(Aus.) drunk.

1904

Sydney Sportsman (Surry Hills, NSW) 27 July 4/3: [H]is mixture had got in its deadly Work, and his guests were inebriated, ‘snickered,’ ‘molar,’ ‘boozed’ or drunk ‘boozed,' or drunk.